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LM5046MH Datasheet(PDF) 2 Page - Texas Instruments |
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LM5046MH Datasheet(HTML) 2 Page - Texas Instruments |
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2 / 41 page  TSSOP28 VIN PGND LO1 VCC LO2 SR2 SR1 HS2 HO2 BST2 HS1 BST1 HO1 COMP RD2 UVLO OVP CS RAMP SSSR AGND SLOPE RT REF RD1 SS SS OFF RES 5 mm x 5 mm WQFN 28 REF RT SLOPE RD2 COMP AGND RD1 PGND LO1 VCC LO2 BST1 SR1 SR2 LM5046 SNVS703G – FEBRUARY 2011 – REVISED MARCH 2013 www.ti.com Connection Diagram Figure 1. TSSOP28 Top View Figure 2. WQFN-28 Package Top View PIN DESCRIPTIONS TSSOP WQFN Name Description Application Information Pin Pin 1 25 UVLO Line Under-Voltage Lockout An external voltage divider from the power source sets the shutdown and standby comparator levels. When UVLO reaches the 0.4V threshold the VCC and REF regulators are enabled. At the 1.25V threshold, the SS pin is released and the controller enters the active mode. Hysteresis is set by an internal current sink that pulls 20µA from the external resistor divider. 2 26 OVP/OTP Over Voltage Protection An external voltage divider from the input power supply sets the shutdown level during an over-voltage condition. Alternatively, an external NTC thermistor voltage divider can be used to set the shutdown temperature. The threshold is 1.25V. Hysteresis is set by an internal current that sources 20 µA of current into the external resistor divider. 3 27 RAMP Input to PWM Comparator Modulation ramp for the PWM comparator. This ramp can be a signal representative of the primary current (current mode) or proportional to the input voltage (feed-forward voltage mode). This pin is reset to GND at the end of every cycle. 4 28 CS Current Sense Input If CS exceeds 750mV the PWM output pulse will be terminated, entering cycle-by-cycle current limit. An internal switch holds CS low for 40nS after either output switches high to blank leading edge transients. 5 1 SLOPE Slope Compensation Current A ramping current source from 0 to 100µA is provided for slope compensation in current mode control. This pin can be connected through an appropriate resistor to the CS pin to provide slope compensation. If slope compensation is not required, SLOPE must be tied to ground. 6 2 COMP Input to the Pulse Width Modulator An external opto-coupler connected to the COMP pin sources current into an internal NPN current mirror. The PWM duty cycle is at maximum with zero input current, while 1mA reduces the duty cycle to zero. The current mirror improves the frequency response by reducing the AC voltage across the opto-coupler. 2 Submit Documentation Feedback Copyright © 2011–2013, Texas Instruments Incorporated Product Folder Links: LM5046 |
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